Required to carry dental insurance - not offered through employer?

When I got divorced my employer offered dental insurance. I lost that job and now my new employer does not offer dental insurance. My ex says I have to have it for our daughter according to our agreement but from my understanding and individual policy in MN is impossible to get. Is this true? He also throws this fact at me when he gets unhappy with our current custody arrangement. :-(
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health-quotes.isgreat.org - my family have this health insurance. It is affordable and has good coverage for dental issues.
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